improved numerical robustness of a unit test.  fixes failures in optimized modes.
improved numerical robustness of a unit test.  fixes failures in optimized modes.

appleseedhq/appleseed,dictoon/appleseed,gospodnetic/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,aiivashchenko/appleseed,glebmish/appleseed,aiivashchenko/appleseed,docwhite/appleseed,luisbarrancos/appleseed,Biart95/appleseed,Biart95/appleseed,dictoon/appleseed,Aakash1312/appleseed,dictoon/appleseed,appleseedhq/appleseed,aiivashchenko/appleseed,luisbarrancos/appleseed,Biart95/appleseed,pjessesco/appleseed,Aakash1312/appleseed,gospodnetic/appleseed,est77/appleseed,est77/appleseed,pjessesco/appleseed,Biart95/appleseed,dictoon/appleseed,pjessesco/appleseed,est77/appleseed,aiivashchenko/appleseed,docwhite/appleseed,appleseedhq/appleseed,pjessesco/appleseed,aytekaman/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,Aakash1312/appleseed,aytekaman/appleseed,docwhite/appleseed,Aakash1312/appleseed,glebmish/appleseed,glebmish/appleseed,aytekaman/appleseed,Vertexwahn/appleseed,dictoon/appleseed,est77/appleseed,appleseedhq/appleseed,docwhite/appleseed,glebmish/appleseed,Vertexwahn/appleseed,gospodnetic/appleseed,Biart95/appleseed,luisbarrancos/appleseed,gospodnetic/appleseed,est77/appleseed,Aakash1312/appleseed,docwhite/appleseed,Vertexwahn/appleseed,aytekaman/appleseed,appleseedhq/appleseed,aiivashchenko/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,glebmish/appleseed